ImageData* ImageData::create(unsigned width,
unsigned height,
ExceptionState& exceptionState) {
if (!width || !height) {
exceptionState.throwDOMException(
IndexSizeError, String::format("The source %s is zero or not a number.",
width ? "height" : "width"));
return nullptr;
}
CheckedNumeric<unsigned> dataSize = 4;
dataSize *= width;
dataSize *= height;
if (!dataSize.IsValid() || static_cast<int>(width) < 0 ||
static_cast<int>(height) < 0) {
exceptionState.throwDOMException(
IndexSizeError,
"The requested image size exceeds the supported range.");
return nullptr;
}
DOMUint8ClampedArray* byteArray =
DOMUint8ClampedArray::createOrNull(dataSize.ValueOrDie());
if (!byteArray) {
exceptionState.throwDOMException(V8Error,
"Out of memory at ImageData creation");
return nullptr;
}
return new ImageData(IntSize(width, height), byteArray);
}
ImageData* ImageData::create(const IntSize& size) {
CheckedNumeric<int> dataSize = 4;
dataSize *= size.width();
dataSize *= size.height();
if (!dataSize.IsValid() || dataSize.ValueOrDie() < 0)
return nullptr;
DOMUint8ClampedArray* byteArray =
DOMUint8ClampedArray::createOrNull(dataSize.ValueOrDie());
if (!byteArray)
return nullptr;
return new ImageData(size, byteArray);
}
ImageData* ImageData::create(const IntSize& size,
DOMUint8ClampedArray* byteArray) {
CheckedNumeric<int> dataSize = 4;
dataSize *= size.width();
dataSize *= size.height();
if (!dataSize.IsValid())
return nullptr;
if (dataSize.ValueOrDie() < 0 ||
static_cast<unsigned>(dataSize.ValueOrDie()) > byteArray->length())
return nullptr;
return new ImageData(size, byteArray);
}
bool ImageBuffer::getImageData(Multiply multiplied, const IntRect& rect, WTF::ArrayBufferContents& contents) const
{
CheckedNumeric<int> dataSize = 4;
dataSize *= rect.width();
dataSize *= rect.height();
if (!dataSize.IsValid())
return false;
if (!isSurfaceValid()) {
size_t allocSizeInBytes = rect.width() * rect.height() * 4;
void* data;
WTF::ArrayBufferContents::allocateMemoryOrNull(allocSizeInBytes, WTF::ArrayBufferContents::ZeroInitialize, data);
if (!data)
return false;
WTF::ArrayBufferContents result(data, allocSizeInBytes, WTF::ArrayBufferContents::NotShared);
result.transfer(contents);
return true;
}
DCHECK(canvas());
RefPtr<SkImage> snapshot = m_surface->newImageSnapshot(PreferNoAcceleration, SnapshotReasonGetImageData);
if (!snapshot)
return false;
const bool mayHaveStrayArea =
m_surface->isAccelerated() // GPU readback may fail silently
|| rect.x() < 0
|| rect.y() < 0
|| rect.maxX() > m_surface->size().width()
|| rect.maxY() > m_surface->size().height();
size_t allocSizeInBytes = rect.width() * rect.height() * 4;
void* data;
WTF::ArrayBufferContents::InitializationPolicy initializationPolicy = mayHaveStrayArea ? WTF::ArrayBufferContents::ZeroInitialize : WTF::ArrayBufferContents::DontInitialize;
WTF::ArrayBufferContents::allocateMemoryOrNull(allocSizeInBytes, initializationPolicy, data);
if (!data)
return false;
WTF::ArrayBufferContents result(data, allocSizeInBytes, WTF::ArrayBufferContents::NotShared);
SkAlphaType alphaType = (multiplied == Premultiplied) ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
SkImageInfo info = SkImageInfo::Make(rect.width(), rect.height(), kRGBA_8888_SkColorType, alphaType);
snapshot->readPixels(info, result.data(), 4 * rect.width(), rect.x(), rect.y());
result.transfer(contents);
return true;
}
bool DrawingBuffer::paintRenderingResultsToImageData(int& width, int& height, SourceDrawingBuffer sourceBuffer, WTF::ArrayBufferContents& contents)
{
ASSERT(!m_premultipliedAlpha);
width = size().width();
height = size().height();
CheckedNumeric<int> dataSize = 4;
dataSize *= width;
dataSize *= height;
if (!dataSize.IsValid())
return false;
WTF::ArrayBufferContents pixels(width * height, 4, WTF::ArrayBufferContents::NotShared, WTF::ArrayBufferContents::DontInitialize);
GLuint fbo = 0;
if (sourceBuffer == FrontBuffer && m_frontColorBuffer.texInfo.textureId) {
m_gl->GenFramebuffers(1, &fbo);
m_gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
m_gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_frontColorBuffer.texInfo.parameters.target, m_frontColorBuffer.texInfo.textureId, 0);
} else {
m_gl->BindFramebuffer(GL_FRAMEBUFFER, framebuffer());
}
readBackFramebuffer(static_cast<unsigned char*>(pixels.data()), width, height, ReadbackRGBA, WebGLImageConversion::AlphaDoNothing);
flipVertically(static_cast<uint8_t*>(pixels.data()), width, height);
if (fbo) {
m_gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, m_frontColorBuffer.texInfo.parameters.target, 0, 0);
m_gl->DeleteFramebuffers(1, &fbo);
}
restoreFramebufferBindings();
pixels.transfer(contents);
return true;
}